Malicious PDF — malware analysis report

Static analysis result for SHA-256 057ebbf9255ccc11…

MALICIOUS

PDF

90.1 KB Created: 2021-06-29 13:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5fff1604006684a881660ecd90a204d7 SHA-1: df6c74cce983591da9aa5b57cabe71c9f57cf12a SHA-256: 057ebbf9255ccc119c752c04b10ceff615af38dc0aff5e1a4c1f0d3515497ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7f0960cf---89686753648.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4a5c514e9502d0d8b1e6d5fee8f3e80d/661250598.pdfIn PDF document text
    • http://toonesk.com/upload/kekikuzafite.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/49746618794.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/47mik74mllmlv9msmtrgnp5u7p/wugejijoboditukesodobi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/tavapilu.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/murisanox.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/6062300334.pdfIn PDF document text
    • http://promador.pl/userfiles/file/65625161770.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/60659029648.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/44682089568.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/27c503243c05b13839396bf51a7b8676/gudesa.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/17626757239.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/82399900344.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wabelekaxuza.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/solajojusegujerob.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tamar.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c927e8ff97---xemizupemajebelatelazopu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95ba3f9d0---41225938845.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/resosiwufegezimanoxarogu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f7037103---widogowokujatelu.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/90057393094.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4d0b64b21ac17dbe3637ab46e9e035c0/xokewowijatobujuzagi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc9978cdc---rexopol.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710bc8ba54c---34940059900.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb49df968---povovaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=four+noble+truths+by+buddhaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10584 bytes
SHA-256: 245ea84f42bcb2a12593c0ec694dc86fc0a73c43d089ee98fb3c4d0b626e7c98
font_01_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 17972 bytes
SHA-256: 91445dfc523e97cf99750c2eeeacc215c04719f6edc477ebb0c21a4fed870253
font_02_sfnt_off00014302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1